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Online Statistics Gathering for ETL – Part 3

Preparing my session on Online Statistics Gathering for ETL for the DOAG conference, I noticed some points that I didn’t covered in the previous two blog posts. The first point is showing the problem that may arise if indexes are involved. The second...

Veröffentlicht 4 Nov 2018 22:32 von triBLOG

Gespeichert unter: SQL, Oracle, Trivadis, ETL, Data Warehouse, 12c, CBO, 18c, incremental statistics, partitin exchange load, online statistics gathering, OSG
10 Tips to Improve ETL Performance – Revised for ADWC

The Autonomous Data Warehouse Cloud (ADWC) is a self-configuring, fast, secure and scalable platform for data warehouses. Does this mean we don’t have to take care anymore about performance of our ETL processes? Which performance tips are still important...

Veröffentlicht 20 Jul 2018 15:29 von triBLOG

Gespeichert unter: SQL, Oracle, Cloud, Performance, ETL, ADWC
Gathering Statistics in the Autonomous Data Warehouse Cloud

Optimizer statistics are essential for good execution plans and fast performance of the SQL queries. Of course, this is also the case in the Autonomous Data Warehouse Cloud. But the handling of gathering statistics is slightly different from what we …...

Veröffentlicht 11 Jul 2018 17:46 von triBLOG

Gespeichert unter: Oracle, Cloud, Performance, ETL, ADWC
External Tables in Autonomous Data Warehouse Cloud

In Oracle Autonomous Data Warehouse Cloud, External Tables can be used to read files from the cloud-based Object Storage. But take care to do it the official way, otherwise you will see a surprise, but no data. Together with my … Continue reading...

Veröffentlicht 4 Jul 2018 23:29 von triBLOG

Gespeichert unter: Oracle, Cloud, ETL, Oracle 18c, ADWC
Online Statistics Gathering for ETL – Part 2

In the first part we looked at general preconditions for online statistics gathering to work and some restrictions. In this part we’ll take a look at what happens with direct path loads into partitioned tables. Partitioning There are also some points...

Veröffentlicht 29 Mai 2018 21:28 von triBLOG

Gespeichert unter: Oracle, Trivadis, ETL, Partitioning, Data Warehouse, 12c, CBO, statistiken, bulk load
Online Statistics Gathering for ETL – Part 1

Online Statistics Gathering has been introduced in 12c and is a very handy feature for ETL and batch jobs developers. However the devil is in the detail. There are some points to remember. Let’s take a closer look. Introduction If you are not familiar...

Veröffentlicht 29 Mai 2018 21:27 von triBLOG

Gespeichert unter: Oracle, Trivadis, ETL, Data Warehouse, 12c, CBO, Merge, statistiken, on the fly, bulk insert
Using Temporary Tables for Complex Reports

Global temporary tables (or private temporary tables, if you use Oracle 18c) are a practical feature to be used for SQL queries with multiple steps, for example complex reports in a data warehouse. If you want to use them, some … Continue reading...

Veröffentlicht 15 Mai 2018 23:40 von triBLOG

Gespeichert unter: SQL, Oracle, Performance, ETL, DWH Architecture
Direct-Path INSERT and NOLOGGING with Oracle 12.2

Direct-Path INSERT is a very efficient way to load data into data warehouse tables. The load performance can even be improved with NOLOGGING on the target table. In Oracle 12c Release 2, this is even possible for Oracle Data Guard … Continue reading...

Veröffentlicht 20 Feb 2018 10:49 von triBLOG

Gespeichert unter: SQL, Oracle, Performance, ETL, Oracle 12c
10 Tips to Improve ETL Performance

In summer time, the nights are very short. For some Data Warehouses, this is the case all year round, but not because of late sunset and early sunrise. The night is not long enough to finish all the ETL jobs. … Continue reading →...( read...

Veröffentlicht 23 Jul 2017 23:01 von triBLOG

Gespeichert unter: SQL, Oracle, Performance, ETL
Partition Exchange in Oracle 12.2

There are many new extensions for Partitioning in Oracle 12c Release 2 (12.2). One of them is the CREATE TABLE FOR EXCHANGE statement. Some years ago, I wished to have this feature for a particular problem with hidden columns. Column … Continue...

Veröffentlicht 9 Feb 2017 16:13 von triBLOG

Gespeichert unter: SQL, Oracle, ETL, Partitioning, Oracle 12c
Delta Detection in Oracle SQL

Delta detection is a common task in every Data Warehouse. It compares new data from a source system with the last versions in the Data Warehouse to find out whether a new version has to be created. There are several … Continue reading →.....

Veröffentlicht 8 Okt 2016 23:05 von triBLOG

Gespeichert unter: SQL, Oracle, ETL
Logging Dynamic SQL

Dynamic SQL is a wonderful feature with a lot of flexibility. Unfortunately, it is not trivial to see the executed SQL statements. A simple trick helps to test and debug PL/SQL code with Dynamic SQL. There are many situations in … Continue reading...

Veröffentlicht 25 Jan 2016 22:23 von triBLOG

Gespeichert unter: SQL, Oracle, ETL, PL/SQL, DWH Automation
Online Statistics Gathering in Oracle 12c

Since Oracle 12c, table statistics are gathered automatically for some bulk operations. This inconspicuous new feature called “Online Statistics Gathering for Bulk Loads” is very practical for ETL jobs in Data Warehouses. I remember an interesting...

Veröffentlicht 23 Dez 2015 13:34 von triBLOG

Gespeichert unter: SQL, Oracle, Performance, ETL, Oracle 12c
Foreign Key Constraints in an Oracle Data Warehouse

Foreign key constraints are often omitted in Data Warehouses. This blog post explains why this is not a good approach and what is a practical compromise for foreign key constraints in an Oracle Data Warehouse. In one of the sessions … Continue reading...

Veröffentlicht 1 Dez 2015 13:22 von triBLOG

Gespeichert unter: SQL, Oracle, Performance, ETL, Materialized Views
Loading Dimensions from a Data Vault Model

Loading data into a Data Vault Model is easy. But how complex is it to extract the data from a Data Vault into a dimensional Data Mart? A Point in Time (PIT) table helps to load Dimensions from a Hub … Continue reading →...( read more ) Mehr...

Veröffentlicht 12 Nov 2015 19:08 von triBLOG

Gespeichert unter: SQL, ETL, Dimensional Modeling, Data Vault Modeling

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Online Statistics Gathering for ETL – Part 3

10 Tips to Improve ETL Performance – Revised for ADWC

Gathering Statistics in the Autonomous Data Warehouse Cloud

External Tables in Autonomous Data Warehouse Cloud

Online Statistics Gathering for ETL – Part 2

Online Statistics Gathering for ETL – Part 1

Using Temporary Tables for Complex Reports

Direct-Path INSERT and NOLOGGING with Oracle 12.2

10 Tips to Improve ETL Performance

Partition Exchange in Oracle 12.2

Delta Detection in Oracle SQL

Logging Dynamic SQL

Online Statistics Gathering in Oracle 12c

Foreign Key Constraints in an Oracle Data Warehouse

Loading Dimensions from a Data Vault Model